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3 years ago

How do I solve this proportion?

Mathematics

2 answers:

tekilochka [14]3 years ago

7 0

$\frac{3}{x}=\frac{7}{10};\ \ \ \ D:x\neq0\\\\cross\ multiply:\\\\7\cdot x=3\cdot10\\\\7x=30\ \ \ \ /:7\\\\x=\frac{30}{7}\\\\x=4\frac{2}{7}$

Elenna [48]3 years ago

6 0

Okay this should be simple. So take 10 times 3. Because those are diagnal to eachother. 10*3 = 30. Now take 30 divided by 7. 30/7 = 4.28 and rounded would be just 4.2. That's your answer! Hope i helped!

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Answer:

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Step-by-step explanation:

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cricket20 [7]

Answer:

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Step-by-step explanation:

It can be helpful to factor the first two terms:

f(x) = x^2(x -7) +36

This can make it easier to evaluate the function for different values of x.

The answer choices suggest you need to know whether f(5) and f(-14) match the values given here.

f(5) = 5^2(5 -7) +36 = -50 +36 = -14 . . . . matches choice B (and E)

f(-14) = (-14)^2(-14-7) +36 = -21(196) +36 . . . . does not match choice A (or D)

The one remaining answer choice we need to consider is C. If we look at f(0) for this equation, we find it is (-5)(-10) +14 = 64, which does not match f(0) = 36 for the function given in the problem statement.

The only true answer choices are B and E.

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The remainder theorem tells you that f(a) = the remainder from f(x)/(x -a).

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